So, i have the 2.5g empty. It doesnt have a filter or heater as i transfered them to the 10g. I dont know if i should use this tank for my little girl... I would get the heater and filter, but that's not the problem. The heaters here are for 5g+, the others are not safe at all. So, my question is, should i get a 50W heater for the 2.5g and later upgrade the tank to a 5g? I''m just confused. I dont know what to do... what should i do?